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Buffer Amplifier using LM339

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apl247

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kchriste

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The reason it doesn't work is that the LM339 is not an OpAmp. It is a quad comparator with open collector outputs.
 
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kchriste

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What range of input and output voltages do you need? Max bandwidth (Frequency)? ie: What do you intend to use it for?
Look for a rail to rail OpAmp if you want 0-5V inputs and outputs while using a single 5V supply. Example: MCP6001, TLV2474, etc.
 
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